A Vertical DSA-MOSFET (VD-MOSFET) has been designed and fabricated, whose gate pattern is selectively removed. This VD-MOSFET has an R
onof 13 mΩ (

V), a C
issof 4300 pF (

V), a blocking voltage of 40 V, and a 232-cm channel width on a 6.5 mm × 6.5 mm chip. Calculated static loss ratio is about 4 percent for 5-V, 15-A output use. Considering the fact that the loss ratio of a Schottky diode is about 8 percent, this new ratio represents a 50-percent improvement.